Etymology

quintillion

Q10U1I1N1T1I1L1L1I1O1N1

Today it means: A billion billion: 1 followed by eighteen zeros, 10¹⁸; one million million million. Full definition →

French quintillion
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The story

  1. French · borrowed fromquintillion
  2. English todayquintillion

From French quintillion. By surface analysis, quint- (“five”) + -illion.

Etymology from Wiktionary, CC BY-SA 4.0.